1 /* symbols.c -symbol table-
2 Copyright (C) 1987, 1990, 1991, 1992, 1993, 1994
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* #define DEBUG_SYMS / * to debug symbol list maintenance */
27 #include "obstack.h" /* For "symbols.h" */
30 /* This is non-zero if symbols are case sensitive, which is the
32 int symbols_case_sensitive
= 1;
34 #ifndef WORKING_DOT_WORD
35 extern int new_broken_words
;
38 /* symbol-name => struct symbol pointer */
39 static struct hash_control
*sy_hash
;
41 /* Below are commented in "symbols.h". */
42 symbolS
*symbol_rootP
;
43 symbolS
*symbol_lastP
;
47 #define debug_verify_symchain verify_symbol_chain
49 #define debug_verify_symchain (void)
54 static void fb_label_init
PARAMS ((void));
58 Return a pointer to a new symbol. Die if we can't make a new
59 symbol. Fill in the symbol's values. Add symbol to end of symbol
62 This function should be called in the general case of creating a
63 symbol. However, if the output file symbol table has already been
64 set, and you are certain that this symbol won't be wanted in the
65 output file, you can call symbol_create. */
68 symbol_new (name
, segment
, valu
, frag
)
74 symbolS
*symbolP
= symbol_create (name
, segment
, valu
, frag
);
77 * Link to end of symbol chain.
81 extern int symbol_table_frozen
;
82 if (symbol_table_frozen
)
86 symbol_append (symbolP
, symbol_lastP
, &symbol_rootP
, &symbol_lastP
);
87 debug_verify_symchain (symbol_rootP
, symbol_lastP
);
93 symbol_create (name
, segment
, valu
, frag
)
94 const char *name
; /* It is copied, the caller can destroy/modify */
95 segT segment
; /* Segment identifier (SEG_<something>) */
96 valueT valu
; /* Symbol value */
97 fragS
*frag
; /* Associated fragment */
99 unsigned int name_length
;
100 char *preserved_copy_of_name
;
103 name_length
= strlen (name
) + 1; /* +1 for \0 */
104 obstack_grow (¬es
, name
, name_length
);
105 preserved_copy_of_name
= obstack_finish (¬es
);
106 #ifdef STRIP_UNDERSCORE
107 if (preserved_copy_of_name
[0] == '_')
108 preserved_copy_of_name
++;
111 #ifdef tc_canonicalize_symbol_name
112 preserved_copy_of_name
=
113 tc_canonicalize_symbol_name (preserved_copy_of_name
);
116 if (! symbols_case_sensitive
)
120 for (s
= (unsigned char *) preserved_copy_of_name
; *s
!= '\0'; s
++)
125 symbolP
= (symbolS
*) obstack_alloc (¬es
, sizeof (symbolS
));
127 /* symbol must be born in some fixed state. This seems as good as any. */
128 memset (symbolP
, 0, sizeof (symbolS
));
131 symbolP
->bsym
= bfd_make_empty_symbol (stdoutput
);
132 assert (symbolP
->bsym
!= 0);
133 symbolP
->bsym
->udata
.p
= (PTR
) symbolP
;
135 S_SET_NAME (symbolP
, preserved_copy_of_name
);
137 S_SET_SEGMENT (symbolP
, segment
);
138 S_SET_VALUE (symbolP
, valu
);
139 symbol_clear_list_pointers (symbolP
);
141 symbolP
->sy_frag
= frag
;
142 #ifndef BFD_ASSEMBLER
143 symbolP
->sy_number
= ~0;
144 symbolP
->sy_name_offset
= (unsigned int) ~0;
147 obj_symbol_new_hook (symbolP
);
149 #ifdef tc_symbol_new_hook
150 tc_symbol_new_hook (symbolP
);
160 * We have just seen "<name>:".
161 * Creates a struct symbol unless it already exists.
163 * Gripes if we are redefining a symbol incompatibly (and ignores it).
167 colon (sym_name
) /* just seen "x:" - rattle symbols & frags */
168 const char *sym_name
; /* symbol name, as a cannonical string */
169 /* We copy this string: OK to alter later. */
171 register symbolS
*symbolP
; /* symbol we are working with */
173 /* Sun local labels go out of scope whenever a non-local symbol is
175 if (LOCAL_LABELS_DOLLAR
&& *sym_name
!= 'L')
176 dollar_label_clear ();
178 #ifndef WORKING_DOT_WORD
179 if (new_broken_words
)
181 struct broken_word
*a
;
186 extern const int md_short_jump_size
;
187 extern const int md_long_jump_size
;
188 possible_bytes
= (md_short_jump_size
189 + new_broken_words
* md_long_jump_size
);
192 frag_opcode
= frag_var (rs_broken_word
,
196 (symbolS
*) broken_words
,
200 /* We want to store the pointer to where to insert the jump table in the
201 fr_opcode of the rs_broken_word frag. This requires a little
204 && (frag_tmp
->fr_type
!= rs_broken_word
205 || frag_tmp
->fr_opcode
))
206 frag_tmp
= frag_tmp
->fr_next
;
208 frag_tmp
->fr_opcode
= frag_opcode
;
209 new_broken_words
= 0;
211 for (a
= broken_words
; a
&& a
->dispfrag
== 0; a
= a
->next_broken_word
)
212 a
->dispfrag
= frag_tmp
;
214 #endif /* WORKING_DOT_WORD */
216 if ((symbolP
= symbol_find (sym_name
)) != 0)
218 #ifdef RESOLVE_SYMBOL_REDEFINITION
219 if (RESOLVE_SYMBOL_REDEFINITION (symbolP
))
223 * Now check for undefined symbols
225 if (!S_IS_DEFINED (symbolP
))
227 if (S_GET_VALUE (symbolP
) == 0)
229 symbolP
->sy_frag
= frag_now
;
231 S_GET_OTHER(symbolP
) = const_flag
;
233 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
234 S_SET_SEGMENT (symbolP
, now_seg
);
237 #endif /* if we have one, it better be zero. */
243 * There are still several cases to check:
244 * A .comm/.lcomm symbol being redefined as
245 * initialized data is OK
246 * A .comm/.lcomm symbol being redefined with
247 * a larger size is also OK
249 * This only used to be allowed on VMS gas, but Sun cc
250 * on the sparc also depends on it.
253 if (((!S_IS_DEBUG (symbolP
)
254 && !S_IS_DEFINED (symbolP
)
255 && S_IS_EXTERNAL (symbolP
))
256 || S_GET_SEGMENT (symbolP
) == bss_section
)
257 && (now_seg
== data_section
258 || now_seg
== S_GET_SEGMENT (symbolP
)))
261 * Select which of the 2 cases this is
263 if (now_seg
!= data_section
)
266 * New .comm for prev .comm symbol.
267 * If the new size is larger we just
268 * change its value. If the new size
269 * is smaller, we ignore this symbol
271 if (S_GET_VALUE (symbolP
)
272 < ((unsigned) frag_now_fix ()))
274 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
279 /* It is a .comm/.lcomm being converted to initialized
281 symbolP
->sy_frag
= frag_now
;
283 S_GET_OTHER(symbolP
) = const_flag
;
285 S_SET_VALUE (symbolP
, (valueT
) frag_now_fix ());
286 S_SET_SEGMENT (symbolP
, now_seg
); /* keep N_EXT bit */
291 #if defined (S_GET_OTHER) && defined (S_GET_DESC)
292 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%d.%d.%ld.",
294 segment_name (S_GET_SEGMENT (symbolP
)),
295 S_GET_OTHER (symbolP
), S_GET_DESC (symbolP
),
296 (long) S_GET_VALUE (symbolP
));
298 as_fatal ("Symbol \"%s\" is already defined as \"%s\"/%ld.",
300 segment_name (S_GET_SEGMENT (symbolP
)),
301 (long) S_GET_VALUE (symbolP
));
304 } /* if the undefined symbol has no value */
308 /* Don't blow up if the definition is the same */
309 if (!(frag_now
== symbolP
->sy_frag
310 && S_GET_VALUE (symbolP
) == frag_now_fix ()
311 && S_GET_SEGMENT (symbolP
) == now_seg
))
312 as_fatal ("Symbol %s already defined.", sym_name
);
313 } /* if this symbol is not yet defined */
318 symbolP
= symbol_new (sym_name
, now_seg
, (valueT
) frag_now_fix (),
321 S_SET_OTHER (symbolP
, const_flag
);
324 symbol_table_insert (symbolP
);
325 } /* if we have seen this symbol before */
327 if (mri_common_symbol
!= NULL
)
329 /* This symbol is actually being defined within an MRI common
330 section. This requires special handling. */
331 symbolP
->sy_value
.X_op
= O_symbol
;
332 symbolP
->sy_value
.X_add_symbol
= mri_common_symbol
;
333 symbolP
->sy_value
.X_add_number
= S_GET_VALUE (mri_common_symbol
);
334 symbolP
->sy_frag
= &zero_address_frag
;
335 S_SET_SEGMENT (symbolP
, expr_section
);
336 symbolP
->sy_mri_common
= 1;
340 tc_frob_label (symbolP
);
348 * symbol_table_insert()
350 * Die if we can't insert the symbol.
355 symbol_table_insert (symbolP
)
358 register const char *error_string
;
361 know (S_GET_NAME (symbolP
));
363 if ((error_string
= hash_jam (sy_hash
, S_GET_NAME (symbolP
), (PTR
) symbolP
)))
365 as_fatal ("Inserting \"%s\" into symbol table failed: %s",
366 S_GET_NAME (symbolP
), error_string
);
368 } /* symbol_table_insert() */
371 * symbol_find_or_make()
373 * If a symbol name does not exist, create it as undefined, and insert
374 * it into the symbol table. Return a pointer to it.
377 symbol_find_or_make (name
)
380 register symbolS
*symbolP
;
382 symbolP
= symbol_find (name
);
386 symbolP
= symbol_make (name
);
388 symbol_table_insert (symbolP
);
389 } /* if symbol wasn't found */
392 } /* symbol_find_or_make() */
400 /* Let the machine description default it, e.g. for register names. */
401 symbolP
= md_undefined_symbol ((char *) name
);
404 symbolP
= symbol_new (name
, undefined_section
, (valueT
) 0, &zero_address_frag
);
407 } /* symbol_make() */
412 * Implement symbol table lookup.
413 * In: A symbol's name as a string: '\0' can't be part of a symbol name.
414 * Out: NULL if the name was not in the symbol table, else the address
415 * of a struct symbol associated with that name.
422 #ifdef STRIP_UNDERSCORE
423 return (symbol_find_base (name
, 1));
424 #else /* STRIP_UNDERSCORE */
425 return (symbol_find_base (name
, 0));
426 #endif /* STRIP_UNDERSCORE */
427 } /* symbol_find() */
430 symbol_find_base (name
, strip_underscore
)
432 int strip_underscore
;
434 if (strip_underscore
&& *name
== '_')
437 #ifdef tc_canonicalize_symbol_name
441 copy
= (char *) alloca (strlen (name
) + 1);
443 name
= tc_canonicalize_symbol_name (copy
);
447 if (! symbols_case_sensitive
)
451 copy
= (unsigned char *) alloca (strlen (name
) + 1);
452 name
= (const char *) copy
;
453 for (; *copy
!= '\0'; copy
++)
455 *copy
= toupper (*copy
);
458 return ((symbolS
*) hash_find (sy_hash
, name
));
462 * Once upon a time, symbols were kept in a singly linked list. At
463 * least coff needs to be able to rearrange them from time to time, for
464 * which a doubly linked list is much more convenient. Loic did these
465 * as macros which seemed dangerous to me so they're now functions.
469 /* Link symbol ADDME after symbol TARGET in the chain. */
471 symbol_append (addme
, target
, rootPP
, lastPP
)
479 know (*rootPP
== NULL
);
480 know (*lastPP
== NULL
);
484 } /* if the list is empty */
486 if (target
->sy_next
!= NULL
)
488 #ifdef SYMBOLS_NEED_BACKPOINTERS
489 target
->sy_next
->sy_previous
= addme
;
490 #endif /* SYMBOLS_NEED_BACKPOINTERS */
494 know (*lastPP
== target
);
496 } /* if we have a next */
498 addme
->sy_next
= target
->sy_next
;
499 target
->sy_next
= addme
;
501 #ifdef SYMBOLS_NEED_BACKPOINTERS
502 addme
->sy_previous
= target
;
503 #endif /* SYMBOLS_NEED_BACKPOINTERS */
506 /* Set the chain pointers of SYMBOL to null. */
508 symbol_clear_list_pointers (symbolP
)
511 symbolP
->sy_next
= NULL
;
512 #ifdef SYMBOLS_NEED_BACKPOINTERS
513 symbolP
->sy_previous
= NULL
;
517 #ifdef SYMBOLS_NEED_BACKPOINTERS
518 /* Remove SYMBOLP from the list. */
520 symbol_remove (symbolP
, rootPP
, lastPP
)
525 if (symbolP
== *rootPP
)
527 *rootPP
= symbolP
->sy_next
;
528 } /* if it was the root */
530 if (symbolP
== *lastPP
)
532 *lastPP
= symbolP
->sy_previous
;
533 } /* if it was the tail */
535 if (symbolP
->sy_next
!= NULL
)
537 symbolP
->sy_next
->sy_previous
= symbolP
->sy_previous
;
540 if (symbolP
->sy_previous
!= NULL
)
542 symbolP
->sy_previous
->sy_next
= symbolP
->sy_next
;
545 debug_verify_symchain (*rootPP
, *lastPP
);
548 /* Link symbol ADDME before symbol TARGET in the chain. */
550 symbol_insert (addme
, target
, rootPP
, lastPP
)
556 if (target
->sy_previous
!= NULL
)
558 target
->sy_previous
->sy_next
= addme
;
562 know (*rootPP
== target
);
566 addme
->sy_previous
= target
->sy_previous
;
567 target
->sy_previous
= addme
;
568 addme
->sy_next
= target
;
570 debug_verify_symchain (*rootPP
, *lastPP
);
573 #endif /* SYMBOLS_NEED_BACKPOINTERS */
576 verify_symbol_chain (rootP
, lastP
)
580 symbolS
*symbolP
= rootP
;
585 for (; symbol_next (symbolP
) != NULL
; symbolP
= symbol_next (symbolP
))
587 #ifdef SYMBOLS_NEED_BACKPOINTERS
588 know (symbolP
->sy_next
->sy_previous
== symbolP
);
590 /* Walk the list anyways, to make sure pointers are still good. */
592 #endif /* SYMBOLS_NEED_BACKPOINTERS */
595 assert (lastP
== symbolP
);
599 verify_symbol_chain_2 (sym
)
602 symbolS
*p
= sym
, *n
= sym
;
603 #ifdef SYMBOLS_NEED_BACKPOINTERS
604 while (symbol_previous (p
))
605 p
= symbol_previous (p
);
607 while (symbol_next (n
))
609 verify_symbol_chain (p
, n
);
612 /* Resolve the value of a symbol. This is called during the final
613 pass over the symbol table to resolve any symbols with complex
617 resolve_symbol_value (symp
)
622 if (symp
->sy_resolved
)
627 if (symp
->sy_resolving
)
629 as_bad ("Symbol definition loop encountered at %s",
631 S_SET_VALUE (symp
, (valueT
) 0);
636 offsetT left
, right
, val
;
637 segT seg_left
, seg_right
;
639 symp
->sy_resolving
= 1;
642 switch (symp
->sy_value
.X_op
)
645 S_SET_VALUE (symp
, 0);
648 S_SET_VALUE (symp
, S_GET_VALUE (symp
) + symp
->sy_frag
->fr_address
);
649 if (S_GET_SEGMENT (symp
) == expr_section
)
650 S_SET_SEGMENT (symp
, absolute_section
);
655 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
657 if (symp
->sy_mri_common
)
659 /* This is a symbol inside an MRI common section. The
660 relocation routines are going to handle it specially.
661 Don't change the value. */
662 S_SET_VALUE (symp
, symp
->sy_value
.X_add_number
);
663 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
667 #if 0 /* I thought this was needed for some of the i386-svr4 PIC
668 support, but it appears I was wrong, and it breaks rs6000
670 if (S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != undefined_section
671 && S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
) != expr_section
)
674 if (symp
->sy_value
.X_add_number
== 0)
675 copy_symbol_attributes (symp
, symp
->sy_value
.X_add_symbol
);
678 (symp
->sy_value
.X_add_number
679 + symp
->sy_frag
->fr_address
680 + S_GET_VALUE (symp
->sy_value
.X_add_symbol
)));
681 if (S_GET_SEGMENT (symp
) == expr_section
682 || S_GET_SEGMENT (symp
) == undefined_section
)
684 S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
));
686 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
691 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
692 if (symp
->sy_value
.X_op
== O_uminus
)
693 val
= - S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
695 val
= ~ S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
698 + symp
->sy_value
.X_add_number
699 + symp
->sy_frag
->fr_address
));
700 if (S_GET_SEGMENT (symp
) == expr_section
701 || S_GET_SEGMENT (symp
) == undefined_section
)
702 S_SET_SEGMENT (symp
, absolute_section
);
703 resolved
= symp
->sy_value
.X_add_symbol
->sy_resolved
;
707 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
708 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
709 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
710 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
711 /* This case comes up with PIC support. */
713 symbolS
*s_left
= symp
->sy_value
.X_add_symbol
;
714 symbolS
*s_right
= symp
->sy_value
.X_op_symbol
;
716 if (seg_left
== absolute_section
)
724 seg_left
= seg_right
;
727 if (seg_right
== absolute_section
728 && s_right
->sy_resolved
)
730 symp
->sy_value
.X_add_number
+= S_GET_VALUE (s_right
);
731 symp
->sy_value
.X_op_symbol
= 0;
732 symp
->sy_value
.X_add_symbol
= s_left
;
733 symp
->sy_value
.X_op
= O_symbol
;
744 case O_bit_inclusive_or
:
746 case O_bit_exclusive_or
:
755 resolve_symbol_value (symp
->sy_value
.X_add_symbol
);
756 resolve_symbol_value (symp
->sy_value
.X_op_symbol
);
757 seg_left
= S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
);
758 seg_right
= S_GET_SEGMENT (symp
->sy_value
.X_op_symbol
);
759 if (seg_left
!= seg_right
760 && seg_left
!= undefined_section
761 && seg_right
!= undefined_section
)
762 as_bad ("%s is operation on symbols in different sections",
764 if ((S_GET_SEGMENT (symp
->sy_value
.X_add_symbol
)
766 && symp
->sy_value
.X_op
!= O_subtract
)
767 as_bad ("%s is illegal operation on non-absolute symbols",
769 left
= S_GET_VALUE (symp
->sy_value
.X_add_symbol
);
770 right
= S_GET_VALUE (symp
->sy_value
.X_op_symbol
);
771 switch (symp
->sy_value
.X_op
)
773 case O_multiply
: val
= left
* right
; break;
774 case O_divide
: val
= left
/ right
; break;
775 case O_modulus
: val
= left
% right
; break;
776 case O_left_shift
: val
= left
<< right
; break;
777 case O_right_shift
: val
= left
>> right
; break;
778 case O_bit_inclusive_or
: val
= left
| right
; break;
779 case O_bit_or_not
: val
= left
|~ right
; break;
780 case O_bit_exclusive_or
: val
= left
^ right
; break;
781 case O_bit_and
: val
= left
& right
; break;
782 case O_add
: val
= left
+ right
; break;
783 case O_subtract
: val
= left
- right
; break;
784 case O_eq
: val
= left
== right
? ~ (offsetT
) 0 : 0;
785 case O_ne
: val
= left
!= right
? ~ (offsetT
) 0 : 0;
786 case O_lt
: val
= left
< right
? ~ (offsetT
) 0 : 0;
787 case O_le
: val
= left
<= right
? ~ (offsetT
) 0 : 0;
788 case O_ge
: val
= left
>= right
? ~ (offsetT
) 0 : 0;
789 case O_gt
: val
= left
> right
? ~ (offsetT
) 0 : 0;
793 (symp
->sy_value
.X_add_number
794 + symp
->sy_frag
->fr_address
796 if (S_GET_SEGMENT (symp
) == expr_section
797 || S_GET_SEGMENT (symp
) == undefined_section
)
798 S_SET_SEGMENT (symp
, absolute_section
);
799 resolved
= (symp
->sy_value
.X_add_symbol
->sy_resolved
800 && symp
->sy_value
.X_op_symbol
->sy_resolved
);
806 /* Give an error (below) if not in expr_section. We don't
807 want to worry about expr_section symbols, because they
808 are fictional (they are created as part of expression
809 resolution), and any problems may not actually mean
815 /* Don't worry if we can't resolve an expr_section symbol. */
817 symp
->sy_resolved
= 1;
818 else if (S_GET_SEGMENT (symp
) != expr_section
)
820 as_bad ("can't resolve value for symbol \"%s\"", S_GET_NAME (symp
));
821 symp
->sy_resolved
= 1;
825 /* Dollar labels look like a number followed by a dollar sign. Eg, "42$".
826 They are *really* local. That is, they go out of scope whenever we see a
827 label that isn't local. Also, like fb labels, there can be multiple
828 instances of a dollar label. Therefor, we name encode each instance with
829 the instance number, keep a list of defined symbols separate from the real
830 symbol table, and we treat these buggers as a sparse array. */
832 static long *dollar_labels
;
833 static long *dollar_label_instances
;
834 static char *dollar_label_defines
;
835 static long dollar_label_count
;
836 static unsigned long dollar_label_max
;
839 dollar_label_defined (label
)
844 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
846 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
848 return dollar_label_defines
[i
- dollar_labels
];
850 /* if we get here, label isn't defined */
852 } /* dollar_label_defined() */
855 dollar_label_instance (label
)
860 know ((dollar_labels
!= NULL
) || (dollar_label_count
== 0));
862 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
864 return (dollar_label_instances
[i
- dollar_labels
]);
866 /* If we get here, we haven't seen the label before, therefore its instance
872 dollar_label_clear ()
874 memset (dollar_label_defines
, '\0', (unsigned int) dollar_label_count
);
877 #define DOLLAR_LABEL_BUMP_BY 10
880 define_dollar_label (label
)
885 for (i
= dollar_labels
; i
< dollar_labels
+ dollar_label_count
; ++i
)
888 ++dollar_label_instances
[i
- dollar_labels
];
889 dollar_label_defines
[i
- dollar_labels
] = 1;
893 /* if we get to here, we don't have label listed yet. */
895 if (dollar_labels
== NULL
)
897 dollar_labels
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
898 dollar_label_instances
= (long *) xmalloc (DOLLAR_LABEL_BUMP_BY
* sizeof (long));
899 dollar_label_defines
= xmalloc (DOLLAR_LABEL_BUMP_BY
);
900 dollar_label_max
= DOLLAR_LABEL_BUMP_BY
;
901 dollar_label_count
= 0;
903 else if (dollar_label_count
== dollar_label_max
)
905 dollar_label_max
+= DOLLAR_LABEL_BUMP_BY
;
906 dollar_labels
= (long *) xrealloc ((char *) dollar_labels
,
907 dollar_label_max
* sizeof (long));
908 dollar_label_instances
= (long *) xrealloc ((char *) dollar_label_instances
,
909 dollar_label_max
* sizeof (long));
910 dollar_label_defines
= xrealloc (dollar_label_defines
, dollar_label_max
);
911 } /* if we needed to grow */
913 dollar_labels
[dollar_label_count
] = label
;
914 dollar_label_instances
[dollar_label_count
] = 1;
915 dollar_label_defines
[dollar_label_count
] = 1;
916 ++dollar_label_count
;
920 * dollar_label_name()
922 * Caller must copy returned name: we re-use the area for the next name.
924 * The mth occurence of label n: is turned into the symbol "Ln^Am"
925 * where n is the label number and m is the instance number. "L" makes
926 * it a label discarded unless debugging and "^A"('\1') ensures no
927 * ordinary symbol SHOULD get the same name as a local label
928 * symbol. The first "4:" is "L4^A1" - the m numbers begin at 1.
930 * fb labels get the same treatment, except that ^B is used in place of ^A.
933 char * /* Return local label name. */
934 dollar_label_name (n
, augend
)
935 register long n
; /* we just saw "n$:" : n a number */
936 register int augend
; /* 0 for current instance, 1 for new instance */
939 /* Returned to caller, then copied. used for created names ("4f") */
940 static char symbol_name_build
[24];
943 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
946 know (augend
== 0 || augend
== 1);
947 p
= symbol_name_build
;
950 /* Next code just does sprintf( {}, "%d", n); */
952 q
= symbol_name_temporary
;
953 for (*q
++ = 0, i
= n
; i
; ++q
)
958 while ((*p
= *--q
) != '\0')
963 /* instance number */
964 q
= symbol_name_temporary
;
965 for (*q
++ = 0, i
= dollar_label_instance (n
) + augend
; i
; ++q
)
970 while ((*p
++ = *--q
) != '\0');;
972 /* The label, as a '\0' ended string, starts at symbol_name_build. */
973 return symbol_name_build
;
977 * Sombody else's idea of local labels. They are made by "n:" where n
978 * is any decimal digit. Refer to them with
979 * "nb" for previous (backward) n:
980 * or "nf" for next (forward) n:.
982 * We do a little better and let n be any number, not just a single digit, but
983 * since the other guy's assembler only does ten, we treat the first ten
986 * Like someone else's assembler, we have one set of local label counters for
987 * entire assembly, not one set per (sub)segment like in most assemblers. This
988 * implies that one can refer to a label in another segment, and indeed some
989 * crufty compilers have done just that.
991 * Since there could be a LOT of these things, treat them as a sparse array.
994 #define FB_LABEL_SPECIAL (10)
996 static long fb_low_counter
[FB_LABEL_SPECIAL
];
997 static long *fb_labels
;
998 static long *fb_label_instances
;
999 static long fb_label_count
;
1000 static long fb_label_max
;
1002 /* this must be more than FB_LABEL_SPECIAL */
1003 #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6)
1008 memset ((void *) fb_low_counter
, '\0', sizeof (fb_low_counter
));
1009 } /* fb_label_init() */
1011 /* add one to the instance number of this fb label */
1013 fb_label_instance_inc (label
)
1018 if (label
< FB_LABEL_SPECIAL
)
1020 ++fb_low_counter
[label
];
1024 if (fb_labels
!= NULL
)
1026 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
1027 i
< fb_labels
+ fb_label_count
; ++i
)
1031 ++fb_label_instances
[i
- fb_labels
];
1033 } /* if we find it */
1034 } /* for each existing label */
1037 /* if we get to here, we don't have label listed yet. */
1039 if (fb_labels
== NULL
)
1041 fb_labels
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
1042 fb_label_instances
= (long *) xmalloc (FB_LABEL_BUMP_BY
* sizeof (long));
1043 fb_label_max
= FB_LABEL_BUMP_BY
;
1044 fb_label_count
= FB_LABEL_SPECIAL
;
1047 else if (fb_label_count
== fb_label_max
)
1049 fb_label_max
+= FB_LABEL_BUMP_BY
;
1050 fb_labels
= (long *) xrealloc ((char *) fb_labels
,
1051 fb_label_max
* sizeof (long));
1052 fb_label_instances
= (long *) xrealloc ((char *) fb_label_instances
,
1053 fb_label_max
* sizeof (long));
1054 } /* if we needed to grow */
1056 fb_labels
[fb_label_count
] = label
;
1057 fb_label_instances
[fb_label_count
] = 1;
1062 fb_label_instance (label
)
1067 if (label
< FB_LABEL_SPECIAL
)
1069 return (fb_low_counter
[label
]);
1072 if (fb_labels
!= NULL
)
1074 for (i
= fb_labels
+ FB_LABEL_SPECIAL
;
1075 i
< fb_labels
+ fb_label_count
; ++i
)
1079 return (fb_label_instances
[i
- fb_labels
]);
1080 } /* if we find it */
1081 } /* for each existing label */
1084 /* We didn't find the label, so this must be a reference to the
1092 * Caller must copy returned name: we re-use the area for the next name.
1094 * The mth occurence of label n: is turned into the symbol "Ln^Bm"
1095 * where n is the label number and m is the instance number. "L" makes
1096 * it a label discarded unless debugging and "^B"('\2') ensures no
1097 * ordinary symbol SHOULD get the same name as a local label
1098 * symbol. The first "4:" is "L4^B1" - the m numbers begin at 1.
1100 * dollar labels get the same treatment, except that ^A is used in place of ^B. */
1102 char * /* Return local label name. */
1103 fb_label_name (n
, augend
)
1104 long n
; /* we just saw "n:", "nf" or "nb" : n a number */
1105 long augend
; /* 0 for nb, 1 for n:, nf */
1108 /* Returned to caller, then copied. used for created names ("4f") */
1109 static char symbol_name_build
[24];
1112 char symbol_name_temporary
[20]; /* build up a number, BACKWARDS */
1115 know (augend
== 0 || augend
== 1);
1116 p
= symbol_name_build
;
1119 /* Next code just does sprintf( {}, "%d", n); */
1121 q
= symbol_name_temporary
;
1122 for (*q
++ = 0, i
= n
; i
; ++q
)
1127 while ((*p
= *--q
) != '\0')
1132 /* instance number */
1133 q
= symbol_name_temporary
;
1134 for (*q
++ = 0, i
= fb_label_instance (n
) + augend
; i
; ++q
)
1139 while ((*p
++ = *--q
) != '\0');;
1141 /* The label, as a '\0' ended string, starts at symbol_name_build. */
1142 return (symbol_name_build
);
1143 } /* fb_label_name() */
1146 * decode name that may have been generated by foo_label_name() above. If
1147 * the name wasn't generated by foo_label_name(), then return it unaltered.
1148 * This is used for error messages.
1152 decode_local_label_name (s
)
1156 char *symbol_decode
;
1158 int instance_number
;
1160 const char *message_format
= "\"%d\" (instance number %d of a %s label)";
1165 for (label_number
= 0, p
= s
+ 1; isdigit (*p
); ++p
)
1166 label_number
= (10 * label_number
) + *p
- '0';
1175 for (instance_number
= 0, p
++; isdigit (*p
); ++p
)
1176 instance_number
= (10 * instance_number
) + *p
- '0';
1178 symbol_decode
= obstack_alloc (¬es
, strlen (message_format
) + 30);
1179 sprintf (symbol_decode
, message_format
, label_number
, instance_number
, type
);
1181 return symbol_decode
;
1184 /* Get the value of a symbol. */
1190 if (!s
->sy_resolved
&& !s
->sy_resolving
&& s
->sy_value
.X_op
!= O_constant
)
1191 resolve_symbol_value (s
);
1192 if (s
->sy_value
.X_op
!= O_constant
)
1193 as_bad ("Attempt to get value of unresolved symbol %s", S_GET_NAME (s
));
1194 return (valueT
) s
->sy_value
.X_add_number
;
1197 /* Set the value of a symbol. */
1200 S_SET_VALUE (s
, val
)
1204 s
->sy_value
.X_op
= O_constant
;
1205 s
->sy_value
.X_add_number
= (offsetT
) val
;
1206 s
->sy_value
.X_unsigned
= 0;
1210 copy_symbol_attributes (dest
, src
)
1211 symbolS
*dest
, *src
;
1213 #ifdef BFD_ASSEMBLER
1214 /* In an expression, transfer the settings of these flags.
1215 The user can override later, of course. */
1216 #define COPIED_SYMFLAGS (BSF_FUNCTION)
1217 dest
->bsym
->flags
|= src
->bsym
->flags
& COPIED_SYMFLAGS
;
1220 #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES
1221 OBJ_COPY_SYMBOL_ATTRIBUTES (dest
, src
);
1225 #ifdef BFD_ASSEMBLER
1231 flagword flags
= s
->bsym
->flags
;
1234 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1237 return (flags
& BSF_GLOBAL
) != 0;
1244 return bfd_is_com_section (s
->bsym
->section
);
1251 return s
->bsym
->section
!= undefined_section
;
1258 if (s
->bsym
->flags
& BSF_DEBUGGING
)
1267 flagword flags
= s
->bsym
->flags
;
1271 if (flags
& BSF_LOCAL
&& flags
& BSF_GLOBAL
)
1274 if (bfd_get_section (s
->bsym
) == reg_section
)
1277 name
= S_GET_NAME (s
);
1278 return (name
!= NULL
1280 && (strchr (name
, '\001')
1281 || strchr (name
, '\002')
1282 || (! flag_keep_locals
1283 && (LOCAL_LABEL (name
)
1286 && name
[1] == '?')))));
1293 return S_IS_EXTERNAL (s
);
1300 return S_GET_NAME (s
) == 0;
1307 return s
->bsym
->name
;
1314 return s
->bsym
->section
;
1318 S_SET_SEGMENT (s
, seg
)
1322 s
->bsym
->section
= seg
;
1329 if ((s
->bsym
->flags
& BSF_WEAK
) != 0)
1330 as_warn ("%s already declared as weak", S_GET_NAME (s
));
1331 s
->bsym
->flags
|= BSF_GLOBAL
;
1332 s
->bsym
->flags
&= ~(BSF_LOCAL
|BSF_WEAK
);
1336 S_CLEAR_EXTERNAL (s
)
1339 if ((s
->bsym
->flags
& BSF_WEAK
) != 0)
1340 as_warn ("%s already declared as weak", S_GET_NAME (s
));
1341 s
->bsym
->flags
|= BSF_LOCAL
;
1342 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_WEAK
);
1349 if ((s
->bsym
->flags
& BSF_GLOBAL
) != 0)
1350 as_warn ("%s already declared as global", S_GET_NAME (s
));
1351 s
->bsym
->flags
|= BSF_WEAK
;
1352 s
->bsym
->flags
&= ~(BSF_GLOBAL
|BSF_LOCAL
);
1356 S_SET_NAME (s
, name
)
1360 s
->bsym
->name
= name
;
1362 #endif /* BFD_ASSEMBLER */
1367 symbol_lastP
= NULL
;
1368 symbol_rootP
= NULL
; /* In case we have 0 symbols (!!) */
1369 sy_hash
= hash_new ();
1371 memset ((char *) (&abs_symbol
), '\0', sizeof (abs_symbol
));
1372 #ifdef BFD_ASSEMBLER
1373 #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL)
1374 abs_symbol
.bsym
= bfd_abs_section
.symbol
;
1377 /* Can't initialise a union. Sigh. */
1378 S_SET_SEGMENT (&abs_symbol
, absolute_section
);
1380 abs_symbol
.sy_value
.X_op
= O_constant
;
1381 abs_symbol
.sy_frag
= &zero_address_frag
;
1383 if (LOCAL_LABELS_FB
)
1395 printf ("%*s", indent_level
* 4, "");
1400 void print_expr_1
PARAMS ((FILE *, expressionS
*));
1401 void print_symbol_value_1
PARAMS ((FILE *, symbolS
*));
1404 print_symbol_value_1 (file
, sym
)
1408 const char *name
= S_GET_NAME (sym
);
1409 if (!name
|| !name
[0])
1411 fprintf (file
, "sym %lx %s", (unsigned long) sym
, name
);
1412 if (sym
->sy_frag
!= &zero_address_frag
)
1413 fprintf (file
, " frag %lx", (long) sym
->sy_frag
);
1415 fprintf (file
, " written");
1416 if (sym
->sy_resolved
)
1417 fprintf (file
, " resolved");
1418 else if (sym
->sy_resolving
)
1419 fprintf (file
, " resolving");
1420 if (sym
->sy_used_in_reloc
)
1421 fprintf (file
, " used-in-reloc");
1423 fprintf (file
, " used");
1424 if (S_IS_LOCAL (sym
))
1425 fprintf (file
, " local");
1426 if (S_IS_EXTERN (sym
))
1427 fprintf (file
, " extern");
1428 if (S_IS_DEBUG (sym
))
1429 fprintf (file
, " debug");
1430 if (S_IS_DEFINED (sym
))
1431 fprintf (file
, " defined");
1432 fprintf (file
, " %s", segment_name (S_GET_SEGMENT (sym
)));
1433 if (sym
->sy_resolved
)
1435 segT s
= S_GET_SEGMENT (sym
);
1437 if (s
!= undefined_section
1438 && s
!= expr_section
)
1439 fprintf (file
, " %lx", (long) S_GET_VALUE (sym
));
1441 else if (indent_level
< 8 && S_GET_SEGMENT (sym
) != undefined_section
)
1444 fprintf (file
, "\n%*s<", indent_level
* 4, "");
1445 print_expr_1 (file
, &sym
->sy_value
);
1446 fprintf (file
, ">");
1453 print_symbol_value (sym
)
1457 print_symbol_value_1 (stderr
, sym
);
1458 fprintf (stderr
, "\n");
1462 print_expr_1 (file
, exp
)
1466 fprintf (file
, "expr %lx ", (long) exp
);
1470 fprintf (file
, "illegal");
1473 fprintf (file
, "absent");
1476 fprintf (file
, "constant %lx", (long) exp
->X_add_number
);
1480 fprintf (file
, "symbol\n%*s<", indent_level
* 4, "");
1481 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1482 fprintf (file
, ">");
1484 if (exp
->X_add_number
)
1485 fprintf (file
, "\n%*s%lx", indent_level
* 4, "",
1486 (long) exp
->X_add_number
);
1490 fprintf (file
, "register #%d", (int) exp
->X_add_number
);
1493 fprintf (file
, "big");
1496 fprintf (file
, "uminus -<");
1498 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1499 fprintf (file
, ">");
1500 goto maybe_print_addnum
;
1502 fprintf (file
, "bit_not");
1505 fprintf (file
, "multiply");
1508 fprintf (file
, "divide");
1511 fprintf (file
, "modulus");
1514 fprintf (file
, "lshift");
1517 fprintf (file
, "rshift");
1519 case O_bit_inclusive_or
:
1520 fprintf (file
, "bit_ior");
1522 case O_bit_exclusive_or
:
1523 fprintf (file
, "bit_xor");
1526 fprintf (file
, "bit_and");
1529 fprintf (file
, "eq");
1532 fprintf (file
, "ne");
1535 fprintf (file
, "lt");
1538 fprintf (file
, "le");
1541 fprintf (file
, "ge");
1544 fprintf (file
, "gt");
1548 fprintf (file
, "add\n%*s<", indent_level
* 4, "");
1549 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1550 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1551 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1552 fprintf (file
, ">");
1553 goto maybe_print_addnum
;
1556 fprintf (file
, "subtract\n%*s<", indent_level
* 4, "");
1557 print_symbol_value_1 (file
, exp
->X_add_symbol
);
1558 fprintf (file
, ">\n%*s<", indent_level
* 4, "");
1559 print_symbol_value_1 (file
, exp
->X_op_symbol
);
1560 fprintf (file
, ">");
1561 goto maybe_print_addnum
;
1563 fprintf (file
, "{unknown opcode %d}", (int) exp
->X_op
);
1573 print_expr_1 (stderr
, exp
);
1574 fprintf (stderr
, "\n");
1577 /* end of symbols.c */
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